According to the latest news at Steampowered, there is a new update for CS: Source. As per the usual, simply restart your Steam client to grab the update.
- Counter-Strike: Source Beta Changes / Additions
- Stopped spectator camera jumping to the wrong player.
- Several fixes to allow Windows 98/ME to work.
- Added spray-logo import ability in the Options dialog.
- Added support for binding non QWERTY (i.e. AZERTY) keyboard keys.
- Improved player movement on high latency links (smoothing out the experience).
- Improved auto-pickup behavior for CS weapons.
- Fixed splash screen not showing up immediately when starting the game in full screen in some cases.
- Players switched via mp_autoteambalance do not lose items, score, or equipment.
- Fixed upper-case characters not being usable in the buy or team selection menus.
- Terrorists now win if all hostages are dead and round timer expires.
- Enabled message of the day.
- Added extra CPU support for Linux dedicated server

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